I'll play next time I switch wheels on my bike. I know mine are pretty darn light even though I run 5" tires. I was on a ride last weekend with a friend and handed my bike to him over a fallen tree. He couldn't believe how light it was.

While i don't obsess about part weights, there is a very noticeable difference in wheel weights. i can easily tell when i am on a tubes vs tubeless wheel. you do get used to it but you can tell. YMMV but wheel weight is something that i will spend extra to get less of it. I also weight 250Lbs so it is a very small % of my overall mass but to me it is worth it.

my axles are about 80 grams i think. don't have my gram scale handy at the moment. the axle is not as critical since it is not rotating. while you don't want a super heavy axle i am not concerned about them. it is also the same axle for all my wheels as the axle goes with the frame

Here's where I was really surprised, and I will weigh my son's wheels when I get a chance. My bike is an aluminum 907 XL frame. I hung it on the scale expecting it to weigh around 32 pounds. It weighs 30.8 pounds. I then thought to myself, my son's Medium with Marge Lites and HuskerDus is probably under thirty pounds. Surprise! It weighs 30.75 pounds. He's split tubeless also but his rear hub is a Salsa. It was pretty heavy if I remember right. All I could get at the time.
I'm currently building him a Large. I'm going to try and make his new one under thirty.